Radio dial illumination



July 31, 1934. v, V 1,968,234

RADIO DIAL ILLUMINATION Filed June 15, 1932 ff J INVENTOR ANTONIUS H.V. VAN LYF ATTORNEY glow discharge lamp Patented July 31, 1934 UNITED STATES PATENT OFFICE RADIO DIAL ILLUMINATION Application June 15, 1932, Serial No. 617,305

In the Netherlands August 27, 1931 3 Claims.

This invention has reference to a device for illuminating housed adjustable portions of wireless receiving or transmitting installations.

It is common to use apparatus of this kind in which the scale of adjustable portions, suchas condensers, potentiometers, variometersjor the like, housed in the apparatus so as to be visible from without, are illuminated by a source of illumination, for

also housed in the apparatus. The lamp-itself is not visible but is arranged so that the light shines. on the parts to be illuminated. The lamp is'usually secured in a holder which adjoins the portions to be illumil6 nated, and is fixed to the frame of'the. senor any,"

other portion.

Now, it has been found that the replacement of the lamps is often very difficult. The lamp with the holder is, so to say,'entirely locked in by 20 the surrounding portions placed in position during the further mounting operation.- It'is often necessary to detach portions from the'set in order to permit of the lamp being withdrawnirom-the holder.

'fdrawn without additional means.

"capable of being withdrawn appreciable extent in order to attain access tothe holder.

It may be endeavored to fix the holderltoltl'ie {latter :is. beingv placed 7 I the holder may be inserted in the front plate and 90 frame of the set orany portionconnected there with and'readily accgssible from without-so, as permit of the holder being withdrawn without the use of any mechanical means, such as screw! drivers or the like.

bodiment theholder is provided with leading-in readily accessible from without.

The combination a simple body very production. with'a handle.

essentially determined by .the distance between favorably to illuminate the particular portions of the'f set, and, the p int 9.

-- The novel features which I believe'to befch'ar invention are set' forth inpar acteristic of my ticularity in the appended'claims, the invention example a small glow lamp or According to the present inventiomthe lamp is secured to a holder capable of being with- The phrase without additional means is'to be understood to mean that there is no need for the device to be dismounted'toany For this reason, in one.em-

members constructed as contact pins and cooperating with contact sockets which in the set are t la p lamp holder 18 may the member 17 directly,-asfor example by moulding.. The

of pin and socketresults in. suitable for economical mass The holder is preierablyprovided The dimensions 0! the holder are I lamp may be intro well; known manner method of operation will best be understood by reference to the'iollowing description taken in connection with the drawing in which I have in-- dicated diagrammatically one circuit organiza- 60 'tion whereby my invention may be carried into effect.

In the drawing, Fig. 1 shows, partly in bodying, the invention,

Fig. 2 is an isometric view of the lamp holder, Fig. 3 is a bottom view of the holder of Fig. 2'.

Considering now the drawing, the scale I of a section, a receiver em- I condenser .2 secured to thefi'ame 3 of aradio set "is illuminated-by a small'lamp I the dark the scale is readily visible through the 8 so. that even in window" 11 The lampj8'is fitted in a holder 6 according to the invention. This holder willbe "more fully described with reference to Figs. 2 and 3. The holder is inserted by-pins 9 into contact sockets 10 secured .to tl ew middle plate 4 0i the frame of thesetr'. The currentis suppliedto' the said sockets"by,;meansi..of;.a cable 1 2.1 '-Fo'r-the I sake of clearness,the-flattachmentof the sockets;

tothe'plateiii-is not'shownin detail.

"A' member ,7 also se'culejd .to the. plate i serves as aiinding edge for inserting the holder; .In theset illustrated'the holder is put into position by. way of the aperture, 313' offthe rearl .plate' through' thespace' The space dis-readily ac- 35 I cessible.j-,.It may have housedi'nitacon'e of a loudspeaker'i i and a few tubes 15 which,;how-

S ver, are-notin the way of theihold er when the in pos'ition.z; 5 Otherwise,

this case the handle may be, givemior example, an elegant shape.

[A modelholder isillustrated in Figs} and 3.,

The; handle is designated by 16. It may be made holderv proper =18are secured. The similarlybe connected to ttachment of the pins 9 to the member 1'1 may-be different, depending on the mawe point or attachmentiorthe holder, which is iz-ie s d o the me b fpre'ierably-situated in therearplateorjthe' npper.

' "'t members :19 EEIIQ- 20.

grooves 21 and recesses 22. The lamp is rigidly held by the spring 19.

, While I have indicated and described one arrangement for carrying my invention into effect, it will be apparent to one skilled in the art that my invention is by no means limited to the particular organization shown and described, but that many modifications may be made without departing from the scope of my invention as set forth in the appended claims.

What I claim is:

1. An illuminating arrangement, adapted for use with a radio indicator dial arranged to be visible through an opening in a radio receiver panel, said arrangement including a lamp socket provided with a holder, and means provided hehind the panel, and on the socket, for positively disposing the socket in dial illuminating position and permitting the removal of the socket when said holder is moved in socket removing direction, said means consisting of at least two contact pins, conductively connected to said socket, and disposed in parallel relation with each other, said pins extending parallel to, and in the same direction as, the said socket.

2. An illuminating arrangement, adapted for use with a radio indicator dial arranged to be visible through an opening in a radio receiver panel, said arrangement including a lamp socket provided with a holder, and means provided behind the panel, and on the socket, for positively disposing the socket in dial illuminating position and permitting the removal of the socket when said holder is moved in socket removing direction, said means consisting of at least two contact pins, conductively connected to said socket, and disposed in parallel relation with each other, said pins extending parallel to, and in the same direction as, the said socket, and at least two finding edges disposed adjacent said holder when the latter is in dial illuminating position.

3. An illuminating arrangement, adapted for use with a radio indicator dial arranged to be visible through an opening in a radio receiver panel, said arrangement including a lamp socket provided with a holder, and means provided behind the panel, and on the socket, for positively disposing the socket in dial illuminating position and permitting the removal of the socket when said' holder is moved in socket removing direction, said means consisting of at least two contact pins, conductively connected to said socket, and disposed in parallel relation with each other, said contact pins projecting from one side of said holder, adjacent said socket, said pins extending parallel to, and in the same direction as, the socket, and being of a length substantially equal to that of the socket.

ANTONIUS HUBERTUS VICTOR VAN LYF.

MID 

